I am in the process of putting my 4160 back together but I came to a hurdle. I found a part in the bottom of my soaking tray that fell out of something. This part is also included in the rebuild kit from holley. I have no idea where it goes please help ha ha...

There is some overlap where more than one carb application will be serviced by a carb kit. Spare parts left over in the kit isn't necessarily a bad thing. Spare parts left over in the carb basket is usually a problem.